Returns the root representing the file system of the revision at the anchor. Give optional pool (null to use default), otherwise use the internal root of the path object. Be careful if you are using the root object but not keeping the path object.

Return the SVK::Path object that $self is at $revision. Note that we don't have forward tracing, so if <$revision is greater than $self-revision>, a SVK::Path at <$revision> will be returned. In other words, assuming foo@N for -r N foo@M when N > M.